Function startWork

packages/react-server/src/ReactFizzServer.js:6172–6206

(request: Request)

}

export function startWork(request: Request): void {
  request.flushScheduled = request.destination !== null;
  // When prerendering we use microtasks for pinging work
  if (supportsRequestStorage) {
    scheduleMicrotask(() => requestStorage.run(request, performWork, request));
  } else {
    scheduleMicrotask(() => performWork(request));
  }
  scheduleWork(() => {
    if (request.status === OPENING) {
      request.status = OPEN;
    }

    if (request.trackedPostpones === null) {
      // this is either a regular render or a resume. For regular render we want
      // to call emitEarlyPreloads after the first performWork because we want
      // are responding to a live request and need to balance sending something early
      // (i.e. don't want for the shell to finish) but we need something to send.
      // The only implementation of this is for DOM at the moment and during resumes nothing
      // actually emits but the code paths here are the same.
      // During a prerender we don't want to be too aggressive in emitting early preloads
      // because we aren't responding to a live request and we can wait for the prerender to
      // postpone before we emit anything.
      if (supportsRequestStorage) {
        requestStorage.run(
          request,
          enqueueEarlyPreloadsAfterInitialWork,
          request,
        );
      } else {
        enqueueEarlyPreloadsAfterInitialWork(request);
      }
    }
  });
}

function enqueueEarlyPreloadsAfterInitialWork(request: Request) {
  const shellComplete = request.pendingRootTasks === 0;